|
Parameter
|
Ratio difference
|
Constant center
|
Mean centering
|
|---|
|
PAR
|
IBU
|
PAR
|
IBU
|
PAR
|
IBU
|
|---|
|
Linearity (μg/mL)
|
2–20
|
2–50
|
2–20
|
2–50
|
2–20
|
2–50
|
|
Slope
|
0.0538
|
0.1267
|
0.5544
|
0.3916
|
318.22
|
0.1949
|
|
Standard error of the slope
|
0.00067
|
0.00084
|
0.00176
|
0.00107
|
3.770
|
0.000354
|
|
Intercept
|
0.009016
|
0.1203
|
0.0318
|
− 0.0114
|
108.66
|
0.5010
|
|
Standard error of intercept
|
0.001722
|
0.02372
|
0.01096
|
0.00091
|
50.507
|
0.01177
|
|
Standard deviation of residuals from line
|
0.01033
|
0.03782
|
0.01637
|
0.00109
|
57.851
|
0.01122
|
|
Accuracy (mean ± SD)
|
99.72 ± 1.71
|
100.11 ± 0.53
|
99.64 ± 0.803
|
99.97 ± 0.641
|
100.21 ± 1.24
|
100.56 ± 0.36
|
|
Intraday precision (RSD%)a
|
0.14
|
0.42
|
0.36
|
0.57
|
0.44
|
0.75
|
|
Interday precision (RSD%)b
|
0.57
|
0.45
|
0.78
|
0.64
|
1.21
|
1.04
|
|
LOD
|
0.63
|
0.985
|
0.097
|
0.01
|
0.59
|
0.189
|
|
LOQ
|
1.537
|
1.985
|
0.295
|
0.0278
|
1.81
|
0.575
|
- aIntraday precision: average of 3 different concentrations in triplicate (n = 9) within the same day
- bInterday precision:average of 3 different concentrations in triplicate (n = 9) repeated on 3 successive days
